Water tube boiler



March 29, 1932. A. 'HUSTER 1,851,842

WATER TUBE BOILER Filed Jul so, 1929 passage Patented Mar. 2 9, 1932UNITED STATES PATENT OFFICE.

ALFRED HUSTER, OF KIEL, GERMANY, ASSIGNOB '10 FRIED. K RUPPGEBMANIAWERIT AKTIENGESELLSCHAFT, OF KIEL-GAARDEN, GERMANY l WATER TUBEBOILER The invention relates to water tube boilers and more particularlyhas reference to a tight tube wall intended for boilers of this classand composed of a plurality of rows of tubes. As well-known, tight tubewalls of this type are formed from two or more rows of tubes by bendingthese tubes on a portion of their length into a common plane. When a orthe combustion gases is provided at the end ofthe tight tube wall, thelatter is resolved again'on a corresponding portion so as to form anewthe original rows of tubes. Owing to the tight wall subsidin into thesespaced rows of tubes at acute ang es and due to the small pitch of theserows, deposit of flue dust-fin front of the passage for the combustiongases is favored. This passage therefore will easily become choked up bydeposits of flue dust and clinker to such an extent of the original tworows that start out from.

that interruption of service occurs. This I already become solid andtherefore is no longer able to stick. By a comparison of Figs. 2 and 4,it is seen that the row H is composed of the tubes of original row C,

drawback is avoided by the invention.

To. this end the invention consists in the fact that the tight tube wallwhich is formed by assembling two or more rows of tubes, in the range ofthe passage for the combustion gases is resolved into a number of rowsof spaced tubes which is at least by one row greater than the rows thewall is ori ally composed of, at least the two first 0 these a spacedrows having a larger pitch than the original rows. The tubes forming theoriginal solid wall are separated unequally.' One fourth of the tubesare bent to form the outermost row, one fourth to form the second rowand one half to formthe third row, each row. behind'the other. Thus thepitch or distance between the tubes of the first two rows is greaterthan that between the tubes of each A the upper drum. Where protectivetubes are. 1

provl e which project beyond the tight tube wall, they are arrangedaccordin to the inventlon so as to be situated each in front of theindividual tubes of the first row of the spaced tubes formin thepassage.

In orderthat the invention can .be more readily understood,an'embodiment of the 882,148, and in Germany August 8, 1928.

water tube boiler designed according to the invention, and

Figures 2 to 4 are horizontal sections, seen from the top, on the lines2-2, 33, 4-4,

' respectively, of Figure 1.

Referrmg to these figures, A denotes the tight tube wall-which is formedby two rows B and Cot vertical tubes. Gombustiongases pass from acombustion chamberE through the tight tube wall A at D where the latteris resolved. According to the invention the tube wall is resolved hereso as to form three rows of tubes F, G, H, the two former having aconsiderably larger pitch than the original rows B and C. The formationof ridg- "ing deposits of solidifying liquid or pasty flue dustisavoided by this arrangement. For, previous to reaching the row of tubesH on its way between the largely pitched rows of tubes F and G, the fluedust has whereas the rows F and G are formed by the alternate tubes oforiginal row B.

front of tube wall A the pitch of which tubes is so chosen that they aresituated just in front of the individual tubes of the row F. Due to thisarrangement they do not narrow the passage areas but notably contributeto a rapid coolin of the fluev dust particles. L denotes the tu es ofthe first row of vertical tubes behind the tight tube yall A.

The location of the tighttube wall itself K denotes protective tubesarranged in and that of the passage" for the gases within i this tubewall may be determined as desired.

What I claim, is

1. A water tube boiler having a tight tube wall composed of at least tworows of tubes and having a passage for the combustion gases, saidpassage being formed by spacing portions of the tubes of said tight tubewall so as to form a number of open rows of tubes which is greater thanthe number of rows the wall is originally composed of, the first ofthese open rows of tubes having a larger pitch than one of the remainingrows.

2. A water tube boiler having a tight tube wall composed of at least tworows of tubes and having a passage for the combustion gases, saidpassage being formed by spacin portions of the tubes of said-tight tubewa so as to form a number of open rows of tubes which is greater thanthe number of rows the wall is originally composed of, at least the twofirst of these open rows of tubes having a larger pitch than theremaining ones.

3. A water tube boiler having a tight tube a wall composed of at leasttwo rows of tubes and having a passage for the combustion gases, saidpassage being formed by spacing portions of the tubes of said tight tubewall so as to form a number of open rows of tubes a which is greaterthan the number of rows the wall is ori inally composed of, protectivetubes arrange in front of said tube wall and situated in the range ofsaid passage 'ust in front of the tubes of the first of sai open rows oftubes.

4. A water tube boiler having a tight tube wall composed of at least tworows of tubes and having a passage for the combustion gases, saidpassage being formed by spacing portions of the tubes of said tight tubewall so as to form a number of open rows of tubes which is greater thanthe number of rows'the wall is originally composed of, protective tubesarranged in front of said tube wall and situated in the range of saidpassage just in front of the tubes of the first of said open rows oftubes, at least the two first of these open rows of tubes having alarger pitch than the remaining ones. v

5. A water tube boiler having a tight tube wall composed of two rows oftubes in alternately adjacent relationship, and having a passage for thecombustion gases, said assa being formed by spacing portions 0 the tu esof said tight tube wall so as to form three open rows, the first two ofthese being formed from one of the first said rows of tubes and each ofthe'first two rows of tubes being formed of alternate tubes of the saidrow,

The foregoing specification signed at Hamburg, Germany, this 15th da ofJul 1929.

ALFRE HUS R.

